United States., D. o. C. (1971). Geographic base file system, uses, maintenance, problem solving: Conference proceedings, November 16-17, 1971, Arlington, Tex. Washington, D.C: Government Printing Office.
Παραπομπή Chicago StyleUnited States., Department of Commerce. Geographic Base File System, Uses, Maintenance, Problem Solving: Conference Proceedings, November 16-17, 1971, Arlington, Tex. Washington, D.C: Government Printing Office, 1971.
Παραπομπή MLAUnited States., Department of Commerce. Geographic Base File System, Uses, Maintenance, Problem Solving: Conference Proceedings, November 16-17, 1971, Arlington, Tex. Washington, D.C: Government Printing Office, 1971.
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